Expandable keyboard



FIG. 1 is a top-right perspective view of an expandable keyboard in an open configuration, where holders are in an upright position;

FIG. 2 is a top-right perspective view in a closed configuration;

FIG. 3 is a top view in an open configuration, where holders are in an upright position;

FIG. 4 is a top view in a closed configuration;

FIG. 5 is a right-side view in an open configuration, where holders are in a collapsed position;

FIG. 6 is a left-side view in an open configuration;

FIG. 7 is a front view in an open configuration, where holders are in a collapsed position;

FIG. 8 is a bottom-left perspective view in an open configuration;

FIG. 9 is a back view in an open configuration; and,

FIG. 10 is a back view in an open configuration.

The broken lines in the drawings illustrate portions of an expandable keyboard which form no part of the claimed design. 

CLAIM The ornamental design for an expandable keyboard, as shown and described. 